mirror of https://gitee.com/openkylin/linux.git
d93a47f735
This patch adds recently added constant blinding helpers into the s390 eBPF JIT. In the bpf_int_jit_compile() path, requirements are to utilize bpf_jit_blind_constants()/bpf_jit_prog_release_other() pair for rewriting the program into a blinded one, and to map the BPF_REG_AX register to a CPU register. The mapping of BPF_REG_AX is at r12 and similarly like in x86 case performs reloading when ld_abs/ind is used. When blinding is not used, there's no additional overhead in the generated image. When BPF_REG_AX is used, we don't need to emit skb->data reload when helper function changed skb->data, as this will be reloaded later on anyway from stack on ld_abs/ind, where skb->data is needed. s390 allows for this w/o much additional complexity unlike f.e. x86. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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